-
Hiroshi Ito
2007 Volume 20 Issue 1 Pages
3-4
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
The photopolymer Science and Technology Award No. 071100, the Outstanding Achievement Award 2007, was presented to Hiroshi Ito (IBM Almaden Research Center) for his outstanding achievements in photopolymer science and technology, "Development of new advanced resist materials for microelectronics".
View full abstract
-
Makiko Irie, Kotaro Endo, Takeshi Iwai
2007 Volume 20 Issue 1 Pages
5-6
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
The Photopolymer Science and Technology Award No. 072100, the Best Paper Award 2007, was presented to Makiko Irie, Kotaro Endo, and Takeshi Iwai, all from Tokyo Ohka Kogyo Co., Ltd., for their outstanding contribution published in Journal of Photopolymer Science and Technology 19(4), 565-568 (2006), entitled "Surface Property Control for 193nm Immersion Resist".
View full abstract
-
Kohei Soga, Aya Okada, Yu Saito, Yuji Kameyama, Tomoya Konishi
2007 Volume 20 Issue 1 Pages
7-9
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
A coating technology for forming a nano-thickness hydrophobic polymer on upconversion nanophoshpors was developed. A mixed resin with pentaerythritol tetraacrylate and triethyleneglycol dimethacrylate was photocured on the surface of the upconversion phosphor particles with 200 nm size to form a solid coating film with 80 nm. According to the FE-SEM observation, the particles are found to be caoted serparately each other.
View full abstract
-
Tomoya Konishi, Kazuaki Shimizu, Yu Saito, Kohei Soga
2007 Volume 20 Issue 1 Pages
11-15
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
The upconversion bioimaging using infrared excitation is expected to solve the problems caused by an ultraviolet or visible excitation light, which damages the organic items in the system and limits the observation time in the conventional fluorescence bioimaging. Yttrium oxide particle doped with erbium are known to show the upconversion and be useful for the upconversion bioimaging. In this study, poly(acrylic acid) (sodium salt) (PAAcNa) was used for both the precursor preparation before calsination and the surface-modification of yttrium oxide nanophosphors doped with 2 mol% of erbium after the calcination. It was found that the use of PAAcNa resulted in a small particle size of 33 nm. The surface modification with PAAcNa increased the dispersion stability and chemical durability of the nanophoshpors in aqueous solution with the pH = 5-10.
View full abstract
-
Nozomu Fujii, Yasunori Kawase, Tsuyoshi Michinobu, Kiyotaka Shigehara
2007 Volume 20 Issue 1 Pages
17-18
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Hirokazu Furue, Kazuhiro Ikeda, Yusuke Yamazaki
2007 Volume 20 Issue 1 Pages
19-22
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
The polymer stabilization (PS) is an attractive technique because the physical property of liquid crystals (LCs) can be improved and furthermore the new characteristics may occur. In this paper, we offer a new type of PS-LC in which the photocure is done at a temperature where the LC medium is in the nematic phase under the application of an electric field. The polymer anchoring strength can be measured quantitatively from the pretilt angle and the surface anchoring strength by utilizing this PS-LC. Furthermore, this PS-LC may possess a quasi memory capability.
View full abstract
-
Rumiko Yamaguchi, Junji Kimura, Susumu Sato
2007 Volume 20 Issue 1 Pages
23-27
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Liquid crystal (LC) alignment properties and the optical writing and erasing have been reported in the LC cell with rubbed Polyvinyl-Cinnamate (PVCi) alignment film. The azimuthal anchoring energy of the PVCi surface increased by the UV light exposure. The optical writing of twisted nematic (TN) orientation domains was demonstrated on the homogeneous orientation background in the LC cell with the UV dosage less than 2 J/cm
2 from a super high pressure Hg lamp. The TN orientation changed to the homogeneous orientation again with the overdose of the UV light and the written image erased, if the LC material with the UV absorption around 313 nm of the line spectrum of the Hg lamp was used. On the other hand, when the LC without the UV light absorption was used, the LC alignment did not change and the written image was kept with the UV dosage more than 30 J/cm
2.
View full abstract
-
Yusuke Takahashi, Kenichi Oyaizu, Kenji Honda, Hiroyuki Nishide
2007 Volume 20 Issue 1 Pages
29-34
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Electroactive and transparent organic radical polymers offered a novel design of materials for electrochromic (EC) devices. A radical polymer containing 2,2,6,6-tetramethylpiperidinoxyl (TEMPO) groups as redox active sites per repeating unit was spin-coated on a counter ITO/glass electrode of the EC device which was also comprised of Prussian blue (PB) as an electrochromic material on ITO and ion-con-ducting polymer gel between the two electrodes. Electrochemical switching of the cell was monitored using the visible absorption of PB (λ
max = 700 nm) that appeared in the oxidized (mixed-valence) state, while the radical polymer was transparent in the visible region in both redox states. PB and the radical polymer were concurrently reduced and oxidized, respectively, on each electrode during the charging process, which corresponded to the decoloration of the cell. The coloration was effected by a discharging process. The electrochromic switching and stability of the cell was characterized by a low driving voltage ΔV and, consequently, a small driving energy ∫ΔVi(t)dt, as a result of a small potential gap between PB and the radical polymer. The optical switch was fast and fully reversible by virtue of the large heterogeneous electron transfer rate constant of the TEMPO center (k
p ≈ 10
-1 cm/s). The polymeric counter electrode material, without dissolution into the electrolyte layer, led to a good open circuit memory that did not require refreshing charges to maintain the redox states of PB.
View full abstract
-
Hitoshi Nakada
2007 Volume 20 Issue 1 Pages
35-38
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Organic Light Emitting Diodes (OLEDs) display on polymer film substrate is developed, which is thin, lightweight, unbreakable and flexible. In this case, plastic is used for substrate and gas barrier film is coated on the substrate for protecting from the moisture. And then, dampproofing is given by thin passivation film after fabricating an OLED. Research of the Organic thin-film transistors (TFTs) to drive the OLEDs is also advanced, and we fabricated the 8x8-pixel display device using Organic TFTs with pentacene in the active layer. This device is driven by the frame frequency of 60Hz and the scan duty factor per line of 1/60, and the luminance of 400 cd/m
2 is obtained.
View full abstract
-
Kenichiro Watanabe, Daisuke Kanai, Toshimitsu Tsuzuki, Eiji Takanaga, ...
2007 Volume 20 Issue 1 Pages
39-42
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Organic electrophosphorescent devices using several small molecules as a host and Ir(ppy)
3 as a green emitting guest have been fabricated by spin coating. We used new host materials in which a cyclohexanyl or adamatyl group was inserted between two phenyl rings of CBP (named Cy-Cz, Ad-cz). The device with Cy-Cz host material and a guest concentration of 24wt% showed an external quantum efficiency of 11% and a power efficiency of 27lm/W at 100cd/m
2. These results suggest that small molecule-based organic electrophosphorescent devices fabricated by spin coating can be highly efficient.
View full abstract
-
Atsushi Kuwahara, Shigeki Naka, Hiroyuki Okada
2007 Volume 20 Issue 1 Pages
43-46
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Organic electron devices are now widely studied for its merits of large area production, ultra thin, ultra light weight, lower process temperature and flexible. One of fascinating characteristics is a larger photosensitivity. By utilizing this feature, organic photo-sensing devices are investigated. Especially in a photodiode, gain of the photocurrent was at most unity and higher photocurrent will not be expected. In this paper, we have investigated organic photoconductor, which has higher gain than the photodiode and preliminary experimental results were shown.
View full abstract
-
Kyung Soo Son, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihay ...
2007 Volume 20 Issue 1 Pages
47-51
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5-pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T
1) of T
1= 2.93 eV (PYD2) and T
1= 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C2]picolinate (FIrpic):PYD2- and 6wt%- FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ
PL= 88±2 % and Φ
PL= 80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (η
EL) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers
View full abstract
-
Masato Shakutsui, Katsuhiko Fujita, Tetsuo Tsutsui
2007 Volume 20 Issue 1 Pages
53-56
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
The evaporative spray deposition from ultra-dilute solution (ESDUS) technique enables preparing a polymer layered structure. The bi-layer structure consisted of two π-conjugated polymers, where the top layer was deposited from tetrahydrofuran (THF) solution with the ESDUS technique onto the preceding bottom layer composed of the other THF-soluble polymer. It has been reported that the external quantum efficiency (EQE) of the polymer light emitting diode (PLED) having the bi-layer structure is significantly higher than a corresponding single-layer device. In the present study, the polymer bi-layer films are prepared at substrate temperatures of 65 °C and 80 °C. While the photoluminescence of the bi-layer film prepared at 80 °C indicated the separation of the two components in the film, that of the film at 65 °C suggested partially mixed structure. The PLED composed of the film at 80 °C exhibited significantly better performance than that at 65 °C and the PLED composed of the spin-coated mixed film. The mixture structure of the two component films can be controlled simply by the substrate temperature during ESDUS deposition.
View full abstract
-
Tatsuya Yamamoto, Kazuo Takimiya
2007 Volume 20 Issue 1 Pages
57-59
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Field-effect transistors (FETs) consisting of vapor-deposited thin-film of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) as an active layer on silanized Si/SiO2 substrates were fabricated and evaluated. Depending on the length of alkyl groups in silanization reagents, FET characteristics of the devices were affected: with octadecyltrichlorosilane (C
18-OTS), devices showing superior FET characteristics up to FET mobility of 3.1 cm
2 V
-1 s
-1 were obtained
View full abstract
-
Tatsuo Mori, Kohei Kato
2007 Volume 20 Issue 1 Pages
61-66
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
We studied the photovoltaic properties of organic thin-film solar cell using 8-hydroxyquinoline aluminum (Alq3), 3,4,9,10-Perylenetetracarb-oxylicdianhydride (PTCDA) and Bathocuproine (BCP) as an exciton-diffusion blocking layer. Although the use of Alq3 caused comparative high open-circuit voltage, it led to much poor short-circuit current. The introduction of optimum thick BCP layer improved photovoltaic properties but the increase in BCP thickness incurred the reduction of those properties. organic thin-film solar cell with PTCDA showed stable photovoltaic properties in spite of the increase in PTCDA thickness. PTCDA was found to be one of excellent exciton-diffusion blocking materials.
View full abstract
-
Hiroshi Mataki, Kaname Tsuchii, Nobuko Mibuka, Ayami Suzuki, Jun Sun, ...
2007 Volume 20 Issue 1 Pages
67-72
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
We fabricated planar polymer optical waveguides doped with Eu-Al nanoclusters, and successfully demonstrated their optical amplification at a wavelength of 614 nm under both pulsed operation using a N
2laser (λ=337 nm) and CW operation using a frequency-doubled diode-pumped solid-state laser (λ=532 nm). The optical gain was found to be as high as 5.57 dB/mm, which, to the best of our knowledge, is the highest one obtained in rare-earth-doped planar optical waveguides. Further, it was confirmed that the concentration quenching is well suppressed in the Eu-Al/PMMA planar waveguide.
View full abstract
-
Noriaki Iguchi, Yong-Jin Pu, Kenichi Nakayama, Junji Kido
2007 Volume 20 Issue 1 Pages
73-75
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Rong-Jer Lee, Wen-Tung Cheng, Jiang-Jen Lin
2007 Volume 20 Issue 1 Pages
77-82
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Diaryliodoium salt was intercalated into anionic and smectic silicate as the hybrid composites. Exposing with ultraviolet light, the silicates encapsulated cationic diaryliodonium were decomposed to form cation and radical intermediates. Photolytical cleave of iodonium salt in layered silicates cell via in situ detection of radical existence by Electron Paramagnetic Resonance is studied. The clay encapsulated iodonium under ultraviolet light exposure shows no signal of lone pair electron of radical species due to ion diffusion and cage effect. The cation diffusion coefficient and the effective ion radius were correlated with d spacing of intercalated clay. It is proposed the silicate's nucleophilic anion rich layers is a extinguish cage of radical products, and the cation to acid transition is favor in the layered silicates cell.
View full abstract
-
Tetsu Tatsuma, Wakana Kubo
2007 Volume 20 Issue 1 Pages
83-86
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Photocatalytic lithography is a method for surface patterning based on photocatalytic remote oxidation. A TiO
2-coated photomask is faced with a surface to be patterned, and irradiated with UV light. If a glass plate modified with alkyl chains is used, hydrophilic/hydrophobic patterns can be obtained. The alkyl chains in the irradiated regions are removed by oxidative decomposition, and those in the non-irradiated regions are left. Irradiation time is 30-60 s, and resolution is about 5 μm. This technique is potentially applicable to fabrication of biochips, lab-on-a-chip devices and simple electronic circuits.
View full abstract
-
Hideyuki Nakano, Toru Takahashi, Takahiro Tanino, Yasuhiko Shirota
2007 Volume 20 Issue 1 Pages
87-89
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Motoi Kinoshita, Tomohiro Kobayashi, Michitsugu Yagi, Tomiki Ikeda
2007 Volume 20 Issue 1 Pages
91-92
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Tetsuya Aoyama, Yasumasa Fukuchi, Takafumi Sassa, Takashi Yamashita, T ...
2007 Volume 20 Issue 1 Pages
93-95
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Yoshiko Koizumi, Shu Seki, Kazumasa Okamoto, Akinori Saeki, Seiichi Ta ...
2007 Volume 20 Issue 1 Pages
97-99
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Atsunori Matsuda, Ryohei Ogawa, Yusuke Daiko, Kiyoharu Tadanaga, Masah ...
2007 Volume 20 Issue 1 Pages
101-105
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Transparent vinylsilsesquioxane-titania (ViSiO
3/2-TiO
) hybrid gel films were prepared from vinyltriethoxysilane and titanium tetrabutoxide by the sol-gel method. UV light irradiation partly cleaved Si-C bonds and addition-polymerized C=C bonds to form Si-O-Si and Si(CH2)nSi linkage in the hybrid films due to the photosensitizing effect of TiO component. The refractive index and dynamic hardness of the hybrid films increased, and the thickness and contact angle for water decreased by the structural changes induced by the UV light irradiation. In comparison with several kinds of organosilsesquioxane-titania (RsiO3/2-TiO, R=methyl, ethyl, phenyl and benzyl) hybrid gel films, ViSiO3/2-Ti,sub>2 was found to show the largest increase in hardness due to the formation of Si(CH2)nSi linkage. Micropatterning was successfully performed on the ViSiO3/2-TiO hybrid films by UV light irradiation through a photomask. The patterned film can be applied as a printing plate with the surface energy differences as well as a micro-optical component with the surface profiles and refractive index differences.
View full abstract
-
Toshiyuki Hyuga, Akihiro Oshima, Atsushi Mori, Hiroyuki Nagai, Nozomi ...
2007 Volume 20 Issue 1 Pages
107-112
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
Micromachining of various polytetrafluoroethylene (sintered PTFE, non-sintered PTFE and expand PTFE) using synchrotron radiation (SR) direct photo-etching has been carried out, and also the etched surface was studied by various analyses. The thin sintered (10μm) and expand (80μm) PTFE films were piled up, and the layered PTFE and non-sintered PTFE (1.2mm) irradiated by SR below the melting temperature, in order to clarify the degree of chemical and physical changes according to the depth from the etched surface. SR irradiated films were examined by
19F solid-state magic-angle spinning (MAS) NMR spectroscopy and differential scanning calorimetric (DSC) analysis. The results showed that the modification by SR irradiation depended on the depth from the surface: within about 60μm from the surface, the network structure formation would be induced even in its solid state; in deeper regions, the chain scission would be dominant. Furthermore, SR was irradiated for non-sintered PTFE with different molecular conformation, compared with usual PTFE. It was found that non-sintered PTFE was also crosslinked in the surface region. Moreover, the sintered and non-sintered PTFE could be etched well. In the case of non-sintered PTFE, the distance of the non-etched remaining structures shrank by heat-treatment at 360°C. The shrinking was about 20%.
View full abstract
-
Taichi Uemura, Masao Sugitani, Masayoshi Kumakura, Tsunehisa Kimura
2007 Volume 20 Issue 1 Pages
113-114
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
This paper is a review of our recent work on a micro-manipulation of the shape of a liquid surface by means of modulated magnetic fields[1]. A microscopic field modulation is achieved by insertion of a field modulator in a homogeneous magnetic field. The surface of a feeble magnetic liquid placed on the modulator is modulated according to the modulation of the field produced over the modulator surface (micro-Moses effect). Upon solidification of the liquid by means of photopolymerization, for example, the surface modulation is fixed. In this paper, an application of this technique to the contact-hole formation on the electrode bumps of IC (integrated circuit) chips is presented.
View full abstract
-
Akira Watanabe, Tokuji Miyashita
2007 Volume 20 Issue 1 Pages
115-116
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Hiroshi Morita, Hiroyuki Sakano, Chika Yamano
2007 Volume 20 Issue 1 Pages
117-123
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
A gaseous mixture of cobalt tricarbonyl nitrosyl (Co(CO)
3NO) and allyltrimethylsilane (ATMeSi) produced sedimentary aerosol particles under UV light irradiation with a medi- um pressure mercury lamp at 313 nm and also with the third and fourth harmonics of a Nd:YAG laser. From the analysis of FT-IR band intensity change of the gaseous molecules, it was shown that photochemical reactions of Co(CO)
3NO were accelerated by the pres- ence of ATMeSi molecules. Chemical structure of the sedimentary particles was analyzed by FT-IR and EDX-SEM. The results showed that the sedimentary particles consisted mainly of Co compounds, and a small amount of ATMeSi molecules played an essential role to form spherical particles. Linearly aggregated fine particles (particle-wires) were formed by modulating the convectional flow of the gaseous mixture.
View full abstract
-
Shu Seki, Satoshi Tsukuda, Seiichi Tagawa, Masaki Sugimoto, Akira Wata ...
2007 Volume 20 Issue 1 Pages
125-128
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Tadashi Kawazoe, Kiyoshi Kobayashi, Motoichi Ohtsu
2007 Volume 20 Issue 1 Pages
129-131
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Hirokazu Takahashi, Masayuki Kanehara, Toshiharu Teranishi
2007 Volume 20 Issue 1 Pages
133-135
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
-
Takashi Hamada, Seiji Watase, Yukihito Matsuura, Hiroshi Kondo, Noboru ...
2007 Volume 20 Issue 1 Pages
137-140
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS
A novel strategy to fabricate the copper pattem by electroless copper plating was investigated. The photolithographic negative pattems were fabricated by the hybrid f11ms with the palladium nanoparticles. The palladium nanoparticles in photo-cured acrylate thin films were an effective catalyst for the electroless copper plating, and it was easily to form the catalysis flne patterns by UV irradiation and development. Addition of silica nanoparticles to the hybrid thin fllms enhanced the performance of catalyst for the electroless copper plating and adhesion between the thin f11m and deposited copper.
View full abstract
-
Alexandre Nicolas, Takumi Ueno
2007 Volume 20 Issue 1 Pages
141-142
Published: 2007
Released on J-STAGE: August 03, 2007
JOURNAL
FREE ACCESS